Meaning of the word "stupid is as stupid does" in English

What does "stupid is as stupid does" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

stupid is as stupid does

US /ˈstuː.pɪd ɪz æz ˈstuː.pɪd dʌz/
UK /ˈstjuː.pɪd ɪz æz ˈstjuː.pɪd dʌz/
"stupid is as stupid does" picture

Idiom

a person should be judged by their actions rather than their appearance or intelligence

Example:
He might look slow, but stupid is as stupid does, and he just outsmarted everyone.
I don't care about his IQ score; stupid is as stupid does.